# Lesson Plan: Factoring Perfect-Square Trinomials Mathematics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to factor a perfect square trinomial expression.

#### Objectives

Students will be able to

- recognize when a trinomial is a perfect square and find unknowns in perfect square trinomials,
- factor perfect square trinomials,
- factor trinomials that result in a perfect square trinomial after removing a common factor from each term,
- evaluate algebraic expressions and evaluate numerical expressions using perfect square trinomials.

#### Prerequisites

Students should already be familiar with

- expanding perfect squares,
- factoring trinomials,
- square roots of perfect squares and rational numbers.

#### Exclusions

Students will not cover

- factoring the difference of two squares,
- factoring trinomials that are not perfect squares.